\begin{tikzpicture}
    \tkzDefPoints{0/0/O}
    \tkzDefPoint(155:1.5){A}
    \tkzDefPoint(335:1.5){B}

    \tkzDrawCircle[thick](O,A)
    \tkzDrawSegments(O,A  O,B)
    \tkzDrawPoint(O)
    \tkzLabelPoints[above](O)
    \tkzLabelPoints[left](A)
    \tkzLabelPoints[right](B)
\end{tikzpicture}

